كليدواژه :
Soil characteristics , شيرابه كمپوست اثر باقيمانده , كود مايع , ذرت , لنامه سنگين , Garbage Leachate , خصوصيات خاك , عملكرد , Yield , Corn composition , Liquid fertilizer , Heavy metals , Residual
چكيده لاتين :
The moisture content of urban soild wastes in Iran is very high. A large volume of Leacahate is , therefore, produced in the process of converting these wastes into compost.The leachate contains relatively large amounts of organic matter , plant nutrients , soluble salts as well as small amounts of some heavy metals.The effects of urban solid waste leachate on growth and yield of corn and heavy metals and nutrients concentrations in plant as well as the effects of leachate residual on soil were studied in field trial conducted in one site (Zeinal) in central Iran(Isfahan).The treatments included applications of 0 , 400 and 800 metric tons of leachate/ha as the main plots and two leaching treatments (0 and 15 cm water height)as the sub-plots in a split plot design. Application of the leachate decreased crust formation and greatly improved germination and growth of corn. Biological yield of corn increased from 6.8 to 11.4 and 8.9 tons/ha for 400 and 800 tons/ha of leachate applications (as compared to the control field ),respectively.Leaching increased corn yield.Uptakes of N , P , K, Fe , Mn , Zn and Cu by corn increased as a result of leachate application.Concentrations of Fe , Mo , Zn , Cu and Cr in plant tissues also increased but no toxic symptoms were observed in plants.Concentrations of Pb, Cd, Cr, Co , and Ni in aerial tissues of corn did not increase as a result of leachate application.The residual effects of leachate application on soil were a decrease in pH and coresponding increases in organic matter content, in electrical conductivity and in available amounts of N,P,K, Fe , Mn , Zn , and Cu.lt is concluded that compost leachate has the potential to be used as an organic liquid fertilizer and soil amendment to improve soil productivity at least for a limited period of time.
